Wellesley Island ZIP Code List — Jefferson County, NY

There is one unique ZIP code in Wellesley Island, New York and it is 13640. Area code: 315.

ZIP codes

12.32

sq mi land

6.59

sq mi water

315

area code

Wellesley Island, NY ZIP code map

About Wellesley Island, NY

Wellesley Island is a picturesque island located in New York, situated within Jefferson County. Known for its stunning natural beauty, it serves as a popular destination for tourists and nature enthusiasts alike. With a rich array of outdoor activities and serene landscapes, Wellesley Island offers a peaceful retreat from the bustle of city life.

Location & geography

Wellesley Island is located in the Thousand Islands region of the Saint Lawrence River and covers a total area of 12.32 square miles of land and 6.59 square miles of water. It is bordered by the mainland to the south, with the nearest city being Alexandria Bay, approximately 7 miles away to the northwest. The island's varied terrain features wooded areas and beautiful waterfronts, making it a perfect spot for outdoor recreation.

Community & economy

The community on Wellesley Island is characterized by its tight-knit atmosphere and vibrant summer tourism. Visitors flock to the island for activities such as boating, fishing, and hiking, contributing to the local economy. Daily life for residents often revolves around the seasonal influx of tourists, with many businesses thriving during the warmer months.

Transportation

Wellesley Island is accessible via State Route 12, which connects it to the larger transportation networks in the region. The nearest major airport is the Watertown International Airport, located about 30 miles away, providing regional flights. Local transit options are limited, emphasizing the island’s charm of slow-paced living.

History

Wellesley Island has a rich history, originally inhabited by Native American tribes before European settlement began in the late 18th century. It became an attractive location for industries such as tourism and recreation, significantly impacting its development over the years. Notable events include the establishment of the Thousand Islands International Bridge, which further enhanced tourism to the region.

Did you know?

One surprising fact about Wellesley Island is that it is home to the Wellesley Island State Park, which offers extensive opportunities for camping and enjoying the natural surroundings. Additionally, the island is renowned for its beautiful historic cottages and summer homes, showcasing unique architectural styles.

ZIP codes for Wellesley Island, NY (1)

ZIP code	City	County	Map
13640	Wellesley Island	Jefferson	View map

Demographics & statistics

302

Population

66.8

Median age

$76,250

Median household income

$42,651

Per capita income

$341,500

Median home value

Median monthly rent

100.0%

Home ownership

6.2%

Poverty rate

42.6%

Unemployment

880

Housing units

54.8%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

20–24

25–34

35–44

45–54

60–64

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	30	9.9%
18 and over	272	90.1%
65 and over	183	60.6%
Median age	66.8 years

Race & ethnicity

White 98.3%

Two or more races 1.7%

Group	Count	%
White	297	98.3%
Two or more races	5	1.7%

Household income

Under $10k 5.1%

$15k–$25k 14.7%

$25k–$35k 4.5%

$35k–$50k 4.5%

$50k–$75k 20.5%

$75k–$100k 16.7%

$100k–$150k 23.7%

$150k–$200k 7.7%

$200k+ 2.6%

Range	% of households
Under $10k	5.1%
$15k–$25k	14.7%
$25k–$35k	4.5%
$35k–$50k	4.5%
$50k–$75k	20.5%
$75k–$100k	16.7%
$100k–$150k	23.7%
$150k–$200k	7.7%
$200k+	2.6%
Median income	$76,250

Housing

Home values

Under $50k 1.9%

$50k–$100k 4.5%

$100k–$150k 2.6%

$150k–$200k 8.3%

$200k–$300k 21.8%

$300k–$500k 34.0%

$500k–$1M 18.6%

$1M+ 8.3%

Housing overview

Metric	Value
Median home value	$341,500
Median rent / month	$0
Owner occupied	100.0%
Renter occupied	0.0%
Vacant	82.3%
Single-family detached	73.8%
Large apartment buildings	0.0%
Mobile homes	3.5%
Median rooms	5.4
Avg household size (owned)	1.94

Year built

Era	%
2020 or later	0.0%
2010–2019	3.8%
2000–2009	10.8%
1990–1999	21.3%
1980–1989	21.9%
1970–1979	1.8%
1960–1969	8.4%
1950–1959	8.2%
1940–1949	2.7%
1939 or earlier	21.1%

Bedrooms

Size	% of units
No bedroom (studio)	2.8%
1 bedroom	8.4%
2 bedrooms	22.4%
3 bedrooms	43.9%
4 bedrooms	20.8%
5+ bedrooms	1.7%

Vehicles per household

Vehicles	% of households
No vehicle	1.3%
1 vehicle	30.8%
2 vehicles	56.4%
3 or more	11.5%

Heating fuel

Fuel type	%
Utility gas	3.8%
Electricity	18.6%
Propane / LP gas	44.9%
Fuel oil	28.2%

Households & families

Household type	Count	%
Married-couple family	58	37.2%
Cohabiting couple	15	9.6%
Male householder, no spouse	45	28.8%
Female householder, no spouse	38	24.4%
Households with children under 18	9	5.8%
Households with seniors (65+)	144	92.3%
Average household size	1.94

Marital status

Status	Male	Female
Never married	18.7%	25.6%
Married	43.2%	38.3%
Separated	2.2%	3.0%
Widowed	24.5%	25.6%
Divorced	11.5%	7.5%

Education

Less than 9th grade 2.5%

Some HS, no diploma 0.0%

HS graduate 29.5%

Some college, no degree 0.0%

Associate's degree 13.3%

Bachelor's degree 33.2%

Graduate / professional 21.6%

Metric	%
HS diploma or higher	97.5%
Bachelor's or higher	54.8%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	5	11.9%
Kindergarten	5	11.9%
Elementary school	15	35.7%
High school	0	0.0%
College / grad school	17	40.5%

Employment

Industry of employment

Professional & management 33.3%

Public administration 28.2%

Retail trade 15.4%

Manufacturing 12.8%

Education & healthcare 10.3%

Occupation

Category	%
Management, business & arts	30.8%
Service	12.8%
Sales & office	43.6%
Natural resources & construction	0.0%
Production & transportation	12.8%

Employment type

Type	%
Private sector	59.0%
Government	28.2%
Self-employed	12.8%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	66.7%
Carpool	0.0%
Public transit	0.0%
Walk	7.7%
Other means	0.0%
Avg commute (minutes)	15.3

Poverty

All people 6.2%

Under 18 years 0.0%

18 and over 6.6%

Married-couple families 0.0%

Female-led households 0.0%

Income support

Source	% of households
Social Security	85.3%
Retirement income	50.6%
Supplemental Security	0.0%
Cash public assistance	0.0%
Food stamps / SNAP	8.3%

Health indicators

Condition	%
High blood pressure	43.9%
High cholesterol	42.0%
Heart disease	9.4%
Stroke	4.1%
Asthma	9.7%
Arthritis	34.6%
Kidney disease	3.9%
Pulmonary disease	9.5%
Cancer	10.1%

Behavior / access	%
Binge drinking	13.7%
No physical activity	25.9%
Less than 7 hrs sleep	30.4%
Fair or poor health	13.9%
Poor mental health	12.0%
Poor physical health	11.3%
No health insurance	8.9%
Visited doctor (checkup)	84.2%
Visited dentist	66.6%
Cholesterol screening	94.5%
Teeth loss	13.1%

Veterans & disability

Veterans	Count	%
Civilian veterans	39	14.3%

Disability	%
Any disability	17.5%
Under 18	0.0%
18–64 years	3.4%
65 and over	27.3%

Health insurance coverage

Type	%
Private insurance	69.2%
Public insurance	79.8%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	292	96.7%
Spanish	0	0.0%
Other Indo-European	0	0.0%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	292	96.7%
Born in same state	292	96.7%
Born in different state	202	66.9%
Foreign born	0	0.0%
Naturalized citizen	10	3.3%
Not a US citizen	6	60.0%

Ancestry

Ancestry	Count	%
French	72	23.8%
Italian	30	9.9%
Arab	26	8.6%

Ancestry	Count	%
English	15	5%
German	4	1.3%
Norwegian	4	1.3%

Technology access

Metric	% of households
Computer access	51.7%
Internet access	100.0%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions

What is the ZIP code for Wellesley Island, NY?

Wellesley Island, NY has one ZIP code: 13640.

What is the main ZIP code for Wellesley Island, NY?

The primary ZIP code for Wellesley Island, NY is 13640. The city uses area code 315 for phone service.

What county is Wellesley Island, NY in?

Wellesley Island is located in Jefferson County, New York.

How many ZIP codes are in Wellesley Island, NY?

Wellesley Island, NY has 1 ZIP code.

What is the ZIP code for Wellesley Island's downtown area and waterfront district along the St. Lawrence River?

The ZIP code for Wellesley Island's downtown area is 13640, which covers the entire island community and its waterfront locations along the St. Lawrence River.

What ZIP code should I use for mailing packages to Wellesley Island State Park on Wellesley Island?

All mail to Wellesley Island State Park and other locations on Wellesley Island should use the ZIP code 13640, which is the only ZIP code serving this island community in Jefferson County.